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Just want to say that if RIAA 20 Hz ideal response is needed then replace 28K resistor to 56K. From 30-100 Hz is difference then 0.4db and in 20 000 to 75 000 Hz is -0.2 db. Original chematics were used.

Hi Guys,I know that this is a really old thread but i have recently completed the Boozehoundlabs phono preamp, and it is fantastic.The only problem is that it is REALLY quiet!When i say quiet i mean that i have to turn the amp nearly all the way up to `11` to get even a reasonable volume.And even i know that this is not a good idea.I read the modification kindly posted by `Ht performance` which suggested placing a 470uF electrolytic audio grade capacitor to R3.So i go online and see that capacitors come in different voltages, now i know that this is a stupid question but what voltage capacitor would be required?I know nothing about electronics so go easy on me.If anyone can suggest a suitable component, or even provide a UK link to a ideal quality one on the `Bay` I would be very grateful.Thank you so much.

The phono preamp have good gain and a high output. It sounds like there is something wrong with your build. The cap may not fix the output issues. Recheck components. You may have a fet in the wrong way.

The phono preamp have good gain and a high output. It sounds like there is something wrong with your build. The cap may not fix the output issues. Recheck components. You may have a fet in the wrong way.

Many thanks mwhouston, I will look into that.But does anyone know the answer to my question about capacitor voltages, as i would like to try the modification anyway.Thank you.

Have not looked yet.Just asking about the modification suggested by `Ht performance` a few pages back.Cannot find my printed circuit diagram at the moment, so I will have to look on the `Boozehound` site.

The phono preamp have good gain and a high output. It sounds like there is something wrong with your build. The cap may not fix the output issues. Recheck components. You may have a fet in the wrong way.

Have not looked yet.Just asking about the modification suggested by `Ht performance` a few pages back.Cannot find my printed circuit diagram at the moment, so I will have to look on the `Boozehound` site.

Hi!

I also felt the need for a little more gain, to feed the oddwatt tube amplifier, because I am running the 6SL7 tube instead of the higher gain 12AX7.

By that time, I made several calculations and also performance tests measurements and the RIAA response is perfect.

You can use electrolytic capacitors starting from 25v.

I am very sure, that if your project is currently well wired like the schematic, you will be extremely happy with this simple modification.

Have not looked yet.Just asking about the modification suggested by `Ht performance` a few pages back.Cannot find my printed circuit diagram at the moment, so I will have to look on the `Boozehound` site.

Hi!

I also felt the need for a little more gain, to feed the oddwatt tube amplifier, because I am running the 6SL7 tube instead of the higher gain 12AX7.

By that time, I made several calculations and also performance tests measurements and the RIAA response is perfect.

You can use electrolytic capacitors starting from 25v.

I am very sure, that if your project is currently well wired like the schematic, you will be extremely happy with this simple modification.

Let us know your listening impressions!

Cheers,

Miguel

Many thanks for your reply (help from Portugal and Australia, what a wonderful thing).I will do the modification you have suggested, and I apologize for my lack of knowledge.

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